本文介绍了卡夫卡生产者发送无效字符的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
使用以下代码,我发送 Elasticsearch 文档以进行索引.我尝试将基本对象转换为 JSON 并通过生产者发送.但是,每条消息(从控制台检查)都会附加诸如 - t {"productId":2455
Using following code, I send Elasticsearch documents for indexing. I tried converting basic Objects to JSON and sent via producer. However, every message (as checked from the console) appends jibberish characters like - ��t�{"productId":2455
public boolean sendMessage()
{
PageRequest page = new PageRequest(0, 1);
Product p = product.findByName("Cream", page).getContent().get(0);
String json = "";
ObjectMapper mapper = new ObjectMapper();
try {
json = mapper.writeValueAsString(p);
} catch (JsonProcessingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
logger.info("JSON = " + json);
boolean status = inputToKafka.send(org.springframework.integration.support.MessageBuilder.withPayload(json).build());
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return status;
}
出站配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-kafka="http://www.springframework.org/schema/integration/kafka"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/integration/kafka http://www.springframework.org/schema/integration/kafka/spring-integration-kafka.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
<int:channel id="inputToKafka">
<int:queue/>
</int:channel>
<int-kafka:outbound-channel-adapter
id="kafkaOutboundChannelAdapter"
kafka-producer-context-ref="kafkaProducerContext"
channel="inputToKafka">
<int:poller fixed-delay="1000" time-unit="MILLISECONDS" receive-timeout="0" task-executor="taskExecutor"/>
</int-kafka:outbound-channel-adapter>
<task:executor id="taskExecutor" pool-size="5" keep-alive="120" queue-capacity="500"/>
<int-kafka:producer-context id="kafkaProducerContext">
<int-kafka:producer-configurations>
<int-kafka:producer-configuration broker-list="localhost:9092"
topic="test_topic"
compression-codec="default"/>
</int-kafka:producer-configurations>
</int-kafka:producer-context>
</beans>
有什么线索吗?
使用的插件:Spring Extension Kafka
推荐答案
我今天遇到了这个问题,并通过在生产者配置中设置正确的 value-serializer 类来解决它,如下所示:
I faced this issue today and got it resolved by setting correct value-serializer class in the producer configuration as shown below:
<int-kafka:producer-configuration
broker-list="localhost:9092" topic="headers['kafka_topic']"
key-class-type="java.lang.String" value-class-type="java.lang.String"
key-serializer="kafkaSerializer" value-serializer="kafkaSerializer"/>
<bean id="kafkaSerializer" class="org.apache.kafka.common.serialization.StringSerializer" />
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